Display device for appreciation

ABSTRACT

A water tank for appreciation provided with a water storage, a water pipe, an air bubble generating member, wherein said water storage is provided with a water inlet port and an opening portion and said opening portion is so provided that the convection can be generated in said water tank for appreciation by the liquid current from a water tank through said opening portion, and said water storage is installed upwardly of a water tank for appreciation and one end of said water pipe is connected to an inlet water port of a water storage and the other end is so installed that it is in the liquid when the liquid is filled in a water tank for appreciation and an air bubble generating member is so installed that it can lead the air bubble inside of a water pipe in the peripheral portion of said other end of said water pipe and a display device for appreciation using said water tank for appreciation are used.

FIELD OF THE INVENTION

The present invention relates to a display device for appreciationregarding pseudo space such as in the water or in the air and regardingcreatures and/or objects which float in the air represented by fish,submarines, spaceships, airships, butterflies, birds, and the like.

BACKGROUND ART

Recently, for a purpose of refreshing feelings of residents and the likeindoors, interiors with motifs in the water or in the air are providedat homes or in the offices. As such interiors, examples of interiorswith motifs in the water include aquariums in which seaweeds or tropicalfish are put in a simple water tank. Recently, aquariums in whichaquatic animals such as tropical fish and the like or aquatic plantssuch as seaweeds and the like are kept in a water tank are used not onlyat home but also at shops and the like as a display for visual effects.In order to keep aquatic animals such as tropical fish and the likewhich are real creatures, living conditions inherent to the creaturesincluding foods, water temperature, and the like should be maintainedand this should accompany labor cost, maintenance cost, and the like.

In order to reduce such labor, a display device is proposed in Japanunexamined patent publication Hei7-230259 provided with pseudo models ofaquatic animals such as fish models and the like, and by generating theair bubble from a ventilation member which is installed at the bottomwall of a water tank to generate water flow in a water tank and to makeviewers feel as if pseudo models of aquatic animals such as fish modelsare swimming as a pseudo aquarium in which daily feeding is not requiredand environmental maintenance such as temperature maintenance and thelike are easy

However, since the above display device generates water flow in a watertank by directly generating air bubble in the water tank in which pseudocreature models are floating, creature models get an imbalance andbehave unnaturally since air bubble adheres to the creature models. Inaddition, in peripheral domains where air bubble near the air bubblegenerating member rises, when the creature models go in said domains,the aquatic animal pseudo models are pushed upward near the watersurface by air bubble, they show unnatural behavior, lying down. Thesame is applied when pseudo creature models are replaced by models suchas submarines other than fish. In addition, when this water tank forappreciation is made to be a display which expresses a space other thanunderwater space, for example, cosmic space where spaceships and thelike exist, or a space with a motif where birds and butterflies and thelike exist, since rising air bubble exists around spaceships, birds,butterflies, and the like, this water tank for appreciation is notsuitable for a display which expresses a space other than underwaterspace.

The object of the present invention is to provide a water tank forappreciation which does not cause imbalance of models by air bubbleadhesion, sudden rising of models in the vicinity of air bubblegenerating member or lying down in the vicinity of a water surface inorder that the models such as creature models represented by fishmodels, for example, naturally swimming show more natural movement andbehavior in the water tank, and further, to provide a water tank forappreciation and a display device for appreciation capable of expressingthe space other than underwater space.

THE DISCLOSURE OF THE INVENTION

The present invention relates to a water tank for appreciation providedwith a water storage, a water pipe, and an air bubble generating member,wherein said water tank is provided with a water inlet port and anopening portion and said opening portion is provided so that thegeneration of the convection is available in said water tank forappreciation by the liquid current from the water storage through saidopening portion, and said water storage is installed upwardly of a watertank for appreciation and one end of said water pipe is connected to awater inlet port portion of a water storage and at the same time, theother end is so installed that it is in the liquid when liquid is filledin a water tank for appreciation and air bubble generating member is soinstalled that the air bubble can be led into inside of said water pipe.Further, it is a display device for appreciation provided with themodels in the liquid provided inside of said water tank forappreciation.

SUMMARY OF THE INVENTION

The preferred embodiments of the present invention have been developedin view of the above-mentioned and/or other problems in the related art.The preferred embodiments of the present invention can significantlyimprove upon existing methods and/or apparatuses.

BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiments of the present invention are shown by way ofexample, and not limitation, in the accompanying figures, in which:

FIG. 1 is a sectional view showing an example of the embodiment when thewater tank for appreciation of the present invention is used for adisplay which expresses underwater world.

FIG. 2 is a view showing an example of the embodiment of an octopusmodel used for the water tank for appreciation of the present invention.

FIG. 3 is a top view of an octopus model in FIG. 2.

FIG. 4 is a sectional view taken along the line A-A of an octopus modelin FIG. 3.

FIG. 5 is a view showing an example of the embodiment of a jelly fishused for the water tank for appreciation of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, the embodiments of the present invention are shown usingfigures. In FIG. 1, water tank for appreciation 1 is installed withwater storage 2 upwardly and said water storage is equipped with waterpipe 3. One end of said water pipe is connected to a water tank at waterinlet port 4 of a water storage and at the other end, air bubblegenerating member 5 is installed. Due to lifting pump operation byaeration of air bubble generated from said air bubble generating member,generation occurs from downward of water pipe to upward through a waterinlet port, liquid is transported to a water storage. Liquid transportedby air bubble aeration is stored in water tank 2, and it free-falls fromopening portion 6 provided at the bottom of water storage 2 and fallsonto liquid in a water tank for appreciation thereby causing convectionin liquid of a water tank for appreciation. Since fish model 7 moves ina water tank for appreciation by surfing convection of liquid in thiswater tank for appreciation, it behaves as if it were a real fish movingaround. By the behavior of the fish in this water tank for appreciation,an effect of softening the people's heart can also be obtained. As saidliquid, water type solvents including water as main ingredient or oiltype solvents whose main ingredient is organic solvent such as alcoholand the like can be used and although they are not specifically limited,water type solvents are preferable since it is easy to obtain and sinceit is hard to vaporize, and as oil type solvents, liquid with goodfluidity is preferable. As said water type solvents, for the convenienceof suspending said fish model, electrolyte or alcohol may be includedfor adjusting specific gravity depending on cases.

It is preferable that said water tank for appreciation is formed bytransparent materials represented by transparent acrylic resin orglasses and it may be a cube, a cylindrical shape, or polygonal columnshape. For information, although the embodiment of the present inventionin FIG. 1 is an embodiment which expresses the space with an underwatermotif, when the water tank for appreciation of the present inventionexpresses aerial regions and the like, fish models can be replaced byspace ship models, butterfly models, bird models, and the like. In thiscase, expression that as if real space ships, butterflies, birds and thelike were flying in the air is available.

Said water tank can store liquid therein and as long as a water inletport which leads liquid to a water storage through a water pipe and anopening portion which enables the convection to generate in said watertank for appreciation by liquid flow from water storage through saidopening portion are provided, shapes, sizes and the like are notspecifically limited and it may be disc-shaped, quadrilateral, orpolygonal plate. Although said water inlet port is not specificallylimited regarding shapes, bore diameters, and the like, and it may bethe same shape and bore diameter, a circular shape of a water pipe ispreferable since it can prevent from generating in a specific direction.

An opening portion provided in said water storage may be provided sothat the convection can be generated in said water tank for appreciationby the liquid flow through said opening portion from a water storage,that the liquid stored in a water storage can free-fall, and that thestored liquid can fall in the liquid in a water tank for appreciation.In FIG. 1, although an opening portion is provided at a bottom surfaceof water storage 2, the opening portion may be provided as long as itcan generate the convection in liquid in a water tank for appreciationby falling in liquid of a water tank for appreciation and it may beprovided on a side surface of a water storage. An install position ofsaid opening portion is not specifically limited as long as the openingportion can generate convection effectively and it may be installed neara wall surface of a water tank for appreciation, or it may be installednear the center of a water tank for appreciation, and the installationplace of the opening portion may appropriately be provided in order toobtain desired convection. Said opening portion may be provided withproper bore diameter appropriately so that the convection in a watertank for appreciation may not have excessive speed and the number ofopening portions can appropriately be provided in relation to the borediameter of an opening portion.

In said water pipe, one end is connected to a water inlet water port ofa water storage installed upwardly of a water tank for appreciation andthe other end is installed so as to pump up the liquid in a water tankfor appreciation. Although said other end may be installed near theupper aperture portion of a water tank for appreciation when a watertank for appreciation is in a state of full capacity all the time, it ispreferable that the other end is installed in the inner lower portion ofa water tank for appreciation, and further, it is more preferable thatthe other end is installed near the bottom wall. Said water pipe is notspecifically limited as long as it is a pipe with a diameter capable ofproviding satisfactory amount of water which is capable of letting airbubble generated from an air generation member pass and which is capableof generating convection in a water tank for appreciation byfree-falling from a water storage, however, for energy efficiency of theamount of air bubble fed in and of liquid transported to a waterstorage, the bore diameter is preferably not greater than 30 mm.Materials of said water pipe are not specifically limited as long asthey have good resistance to corrosion. When transparent acryl is usedfor said water pipe, since wandering air bubble can be appreciated, awater tank for appreciation is available with good visual effect andfurther, varieties of visual effects can be obtained by lighting thewater tank. Further, by making the color of said water pipe same as abackground color, it can minimize and conceal the appearance of saidwater pipe in a water tank for appreciation. Since said water pipe canfunction as a column support of a water storage by providing one waterpipe near the central portion of a water tank for appreciation as inFIG. 1, a device for retaining a water storage on the upper portion of awater tank for appreciation can be omitted, however, plurality of waterpipes can be provided. For information, although said water pipe ispreferably linear when it functions as a column support of a waterstorage for securing strength, it may be spiral and as long as water canbe transported to a water storage by lifting effect of air bubble, shapethereof is not specifically limited.

Said air bubble generating member is not specifically limited as long asit can generate air bubble, and as long as it is a member capable ofgenerating air bubble which can generate liquid flow capable oftransporting liquid to a water storage in a water pipe and it may be aporous thecal member or a perforated tube. In FIG. 1, air bubblegenerating member 5 is connected to air carrier 9 through pipe 8. Airconveyor 9 is not specifically limited as long as it can transport airthrough pipe 8 and a publicly known pump can be used, however, if an airbubble generating member is a member capable of generating gas byitself, there is no particular need for installing air conveyor andthrough pipe. Said air bubble generating member may be installed in saidwater pipe or the lower portion of the other end of said water pipe aslong as said air bubble generating member is so installed that airbubble can be led from the aperture of said other end of a water pipe.

In FIG. 1, near the bottom surface of water tank for appreciation 1,divider plate 10 which is set parallel to the bottom surface isinstalled. In a water tank for appreciation of the present invention,for example, by providing said divider plate, water storage portionunder the bottom 11 is provided which is divided by divider plate 10near the bottom surface of said water tank for appreciation, and byconnecting the other end of water pipe to water inlet port 12 which hasthe same diameter of that of water pipe provided in said divider plate,said water storage portion under the bottom and said water storage areconnected by water pipe, liquid stored in water storage portion underthe bottom may be transported to a water storage through a water pipe.In other words, in a water tank for appreciation of the presentinvention, when said divider plate is used, the present invention isaforementioned water tank for appreciation and further, in the bottomdirection of water tank for appreciation, when a divider plate isinstalled and said water pipe connects the water storage portion underthe bottom sectioned by the bottom of said water tank for appreciationand a divider plate and said water storage, the present invention is awater tank for appreciation which is installed vertically near thecentral portion of a water tank for appreciation. By providing saiddivider plate, said divider plate functions substantially as an inletwhich inhales liquid of said water pipe and since it means that theinlet is provided in a wide range, inhalation pressure of water pipegenerated by lifting effect of air bubble decreases by proliferation andit becomes easy to prevent the fish models and the like from beingsucked to said water pipe and further, since the device like appearancecan be avoided since the inlet portion of the other end of water pipe ishidden, which is preferable for appreciation. As said divider plate, byusing the plate provided with innumerable openings represented by porousplate and meshes, filtering function can be provided, which ispreferable.

In the water tank for appreciation of the present invention, by theliquid flow falling from a water storage, the convection can begenerated in a liquid stored in a water tank for appreciation and thisconvection originally makes the viewer feel that the fish modelsfloating on one place in the liquid swim, however, the fish model with afin provided with polymeric actuator may be used. In other words, thepresent invention is the water tank for appreciation provided with awater storage, a water pipe, and an air bubble generating member,wherein said water storage is provided with a water inlet port and anopening portion, and said opening portion is so provided that theconvection can be generated in said water tank for appreciation by theliquid flow from the water storage through said opening portion, andsaid water storage is installed upwardly of a water tank forappreciation and one end of said water pipe is connected to a waterinlet port of a water storage and the other end is so installed in awater tank for appreciation that the said end is in liquid when water isfilled in the water tank for appreciation, and air bubble generatingmember is so installed that can lead air bubble inside of said waterpipe in the peripheral portion of said other end of said water pipe, andfurther, provided with the fish models equipped with polymeric actuatorand liquid. The fish models equipped with said polymeric actuator isprovided with a power source and a relay circuit inside thereof and byusing polymeric actuator for the whole pectoral fin and/or tail fin ortheir base portion, the fish models can swim spontaneously. With thewater tank for appreciation of the present invention, the convection inthe upward and downward direction can be generated and with the forwardmovement of said fish models, the provision of a display in which thefish models naturally move is available.

It is preferable that in said water tank for appreciation, the outerdiameter for in-room use is 50 to 1000 mm when the shape is cylindrical.When the outer diameter of said water tank for appreciation is less than50 mm, it is difficult to express the desirable space since the space istoo small. When the outer diameter of said water tank for appreciationis greater than 1000 mm, installation of said water tank forappreciation requires labor since the large place for installing thedisplay of a water tank for appreciation. When said water tank forappreciation is used for a display device for in-room use, the outerdiameter of said water tank for appreciation can be made to be 50 to 500mm and when it is used for a water tank for appreciation on the table,the outer diameter of said water tank for appreciation can be made to be150 to 200 mm. When the shape of said water tank for appreciation isrectangular, column shaped, the size can be made to be the correspondingvolume of cylindrical water tank for appreciation as mentioned above.Regarding the height of said water tank for appreciation, the height canbe made to be the one which corresponds to the size of models put insideof the water tank for appreciation and the movement required for themodels.

When said water tank for appreciation is a cylindrical water tank andthe outer diameter of the water tank for appreciation is 150 to 200 mm,for example, a cylindrical water storage with an inner diameter of 60 mmcan be used. Since this water storage generates the convection in theliquid which is stored inside of a water tank for appreciation with aheight of 300 mm, for example, 6 opening portions with a diameter of 2to 3 mm can be provided. The opening portions provided at the bottompotion of this water storage can be provided in a way that the linewhich connects from the center on a surface of the bottom portion ofwater storage to each opening portion makes 120° each other.

Said water tank for appreciation can provide at least 2 coils woundalong the periphery of said water tank for appreciation. Sinceelectromagnetic field generates when turned on electricity to the coilswound along the periphery of said water tank for appreciation, said fishmodels need not have a power source such as batteries and the like whensaid fish models are provided with coils for power generation.Therefore, the display device for appreciation using fish modelsprovided with coils for power generation as a means to obtain drivingelectric power of said actuator elements can save exchange of powersources such as batteries and the like and since it does not show theviewer of the display the operation of battery exchange, it is excellentas a display device for appreciation.

The coils to be provided not less than 2 along the peripheral of saidwater tank for appreciation are the coils for generating electromagneticfield as mentioned above. In said water tank for appreciation providedwith not less than 2 coils for generating magnetic field, since thestrength of the electromagnetic field is relatively uniform inside ofthe water tank for appreciation compared with a water tank forappreciation provided with 1 coil for generating electromagnetic field,control of the movement of the models provided with coils for generatingelectromagnetic field to make uniform is easy. It is preferable that thecoils wound along the periphery of said water tank for appreciation areso provided that the distance between neighboring coils are set to bethe length of not greater than 200% of a coil diameter in said watertank for appreciation. It is further preferable that the coils woundalong the periphery of said water tank for appreciation are so providedthat the distance between neighboring coils are set to be the length of80 to 120% of a coil diameter in said water tank for appreciation andfurther, it is more preferable that the distance between neighboringcoils is substantially the same as the coil diameter. When the coils forgenerating electromagnetic field are so provided in said water tank forappreciation that the distance between neighboring coils are set to bewithin the above range, uniform electromagnetic field can be obtainedeffectively and also a beautiful appearance of a water tank forappreciation can be provided. Regarding the coils provided in said watertank for appreciation, when said water tank for appreciation is onetank, it is preferable that these coils are set in two places of upperportion and lower portion of said water tank for appreciation so thatthese coils do not obscure the view. When said water tank forappreciation is divided into substantially two and more in the upper andlower direction, by providing said coils in the boundary portion of thesection, three or more coils for generating magnetic field can beprovided without obscuring the view. For information, in order to obtainuniform electromagnetic field inside of said water tank forappreciation, coils for generating electromagnetic field can be providedfor the water tank for appreciation so that the distance betweenneighboring coils are set to be the length of not greater than 200% of acoil diameter. In addition, in order to make induced current generatingin the coils for power generation substantially constant, it ispreferable that the coils for generating the electromagnetic field turnon electricity so that the electromagnetic field is generated in thesame direction in each coil.

The diameter of coils which are provided two or more in the periphery ofsaid water tank for appreciation is not specifically limited. Since saidcoils are wound along the periphery of said water tank for appreciation,said coil diameter may be substantially the same length as innerdiameter or outer diameter of said water tank for appreciation.

Although the number of turn of coils wound along the periphery of saidwater tank for appreciation is not specifically limited, it ispreferably 20 to 200 turns, and more preferably, 40 to 60 turns, andfurther preferably, 50 turns. In addition, when the number of turn ofcoils is greater than 200 turns, coils are heated and therefore, thetemperature inside of the display for appreciation tends to rise and theliquid stored inside of a display for appreciation is liable tovaporize. When the number of winding of coils is less than 20 turns, thestrength of magnetic field generated by coils becomes weak and inducedcurrent of the coils for power generation becomes weak. The water tankfor appreciation with two or more coils provided which are wound withthe number of turn within the said range can preferably be used for adisplay device for appreciation since it easily provides coils for powergeneration which is included in the models in the liquid stored insideof the water tank for appreciation with a certain induced current.Although the voltage at the time of turning on electricity to the coilsfor generating the magnetic field provided in the water tank forappreciation is not specifically limited, it can be used within therange of 100 V to 200 V.

Regarding said water tank for appreciation, explanation was made in thecase where the fish models are used. In said display device forappreciation, instead of fish models, by employing such creatures and/orobjects that float in the air space represented by submarines,spaceships, airships, butterflies, birds, and the like, display devicefor appreciation regarding pseudo space such as underwater or in theair.

The models put in the liquid which is stored inside of said water tankfor appreciation are not limited to fish models and at least one modelfor creatures among the group of fish models, jelly fish models, octopusmodels, snake models, shell models, and sea weed models. In addition,since said models of creatures are not limited to aquatic animals andmodels of creatures depending on motifs of the display can be used, saidmodels of creatures may be the models of invertebrates and/orvertebrates.

FIG. 2 is a figure which shows one embodiment of an octopus model whichcan be used as said display device for appreciation. Octopus model 21 isprovided with 8 legs in body 22. FIG. 3 is a top view of the octopusmodel. In the octopus model of FIG. 3, leg portion 23 is composed of 3portions. Said leg portion is composed of tip end portion 24, middleportion 25, and a base portion which leads to a body portion. In FIGS. 2and 3, the leg portion of octopus model 21 is formed by actuatorelements. Said actuator elements can receive electric supply from apower source or coils for power generation. Since electric power issupplied to said actuator elements, the actuator elements used for legportion starts curvature movement and it moves like a leg portion ofoctopus.

FIG. 4 is a sectional view taken along the A-A line of the octopusmodels of FIG. 3. Each of body portion 22, middle portion 25, and tipend portion 24 is composed of actuator elements. In tip end portion 24,metal layer 241 and metal layer 242 are laminated through polymericelectrolytes 243 therebetween. In middle portion 25, metal layer 251 andmetal layer 252 are laminated through polymeric electrolyte layer 253therebetween. Regarding body portion 22 which includes base portion,likewise, metal layer 221 and metal layer 222 are laminated throughpolymeric electrolytes 223 therebetween. As actuator elements in whichthese two metal layers used as a body portion, a middle portion and atip end portion laminate through polymeric electrolytes therebetween,publicly known ones can be used. Metal layer 221 is connected toconductive wire 28 and metal layer 222 is connected to conductive wire29. With the connection of conductive wire 28 and conductive wire 29with power source 30, voltage is applied to the actuator element whichis body portion 22. In FIG. 4, metal layer 221, metal layer 252, andmetal layer 252′ are installed so that they contact with each other.Each actuator element is so installed that metal layer 252′, metal layer241′, metal layer 252′, and metal layer 241′ contact with each other. Byconnecting metal layer 222, metal layer 251, and metal layer 251′ withconnecting wires respectively and by connecting metal layer 251, metallayer 242, and metal layer 242′ with connecting wires respectively,curvature like that of an octopus is available since leg portion makescurvature movement of S shape.

FIG. 5 is a figure which shows one embodiment of a jelly fish modelwhich can be used for said display device for appreciation. While in theoctopus model in FIG. 2, one leg portion is composed of 3 actuatorelements, in jelly fish model 51, one leg portion is composed of oneactuator element. Body portion 53 can be provided with a power source orcoils for generating power. By providing a power source or coils forgenerating power, electric power can be provided to a leg portionthereby enabling the leg portion to curve. By the curvature movement ofsaid leg portion, as shown in FIG. 5, leg closed state 52 or leg openedstate 51 is available. For information, as said actuator elements, knownactuator elements can be used and for example, elements to which metalelectrode is connected by electroless deposition of ion exchange resincan be used.

As creature models, other than aforementioned octopus models or jellyfish models, snake models, shell models, and sea weed models can beused. For example, a leg portion of octopus models shown in FIGS. 2 to 4can be used alone or can be used in a bundle, thereby making snakemodels or shell models. As sea weed models, actuator elements can beused in a portion which is seen like a hand of clione models, therebymaking the behavior of clapping. Further, as said creature models, otherthan aforementioned, the kinds of creatures are not limited and modelsfor invertebrates including sea hares or sea cucumbers and/or models forvertebrates can be used. In addition, since creature models are providedin liquid which is stored in a water tank for appreciation, these modelsare preferably models of aquatic animals for showing more real taste.

In FIGS. 2 to 5, embodiments of creature models are shown. Actuatorelements used for models of these embodiments can show swaying motion bycontrolling the phase of voltage applied for electric potential and bymaking these elements curve. Methods for controlling the phase ofelectric potential are not specifically limited. For example, the phaseof electric potential applied to actuator elements can be controlled byconnecting actuator elements to a power source or coils for generatingpower through a control device therebetween. In addition, by controllingthe conductivity of coils provided in a water tank for appreciation, thephase of electric potential can also be controlled by controlling theinduced current by coils for generating power.

In addition, instead of using aforementioned creature models, as adisplay device for appreciation using the aforementioned water tank forappreciation, non-creature models or objects such as submarines,airships, airplanes, and the like can be used. Further models ofcreatures other than aquatic animals such as those of butterflies or ofbirds can be used. By using models or objects that are other thanaquatic animals, said display device for appreciation can provideviewers with pseudo spaces such as underwater space or air spaceregarding the creatures and/or objects which float in the air.

Further, in said models, light-emitting diode can be provided. By themovement of models caused by the convection of said water tank forappreciation, models move softly and with the light by light-emittingdiode, the models can provide softer impression for the viewers of thedisplay device for appreciation in the dark room. Said light-emittingdiode can be provided both inside and outside of the models. Althoughthe electric power supplied to said light emitting diode may be suppliedfrom the power source of batteries and the like which are installed inthe models, it is preferable that the electric power is supplied fromthe coils for generating power to light-emitting diode in order to makemovement of models more smooth by making said models light weighted. Assaid light-emitting diodes, known light-emitting diodes can be used andthe kinds thereof are not specifically limited. Said light-emittingdiodes may be provided with models together with actuator elements ormay be provided with the models which are not provided with actuatorelements.

Although said liquid when used for a water tank for appreciationprovided with fish models which are provided with said polymericactuator is liquid which is stored in a water tank for appreciation andin which said fish models are put, it is an aqueous solvent includingwater as a main ingredient or an oily solvent whose main ingredients areorganic solvents such as alcohols and it is not specifically limited andfor the convenience of making said fish models float, in order to adjustspecific gravity accordingly, electrolytes or alcohols can be containedin an aqueous solvent. For information, when a fin portion as a whole isa bimorph structured actuator, it is preferable that said liquid is asolution of electrolyte which contains specific dopant ion in specificconcentration.

Regarding a water tank for appreciation, the explanation was made asmentioned above when using fish models. Models which are put in liquidstored inside of said water tank for appreciation are not limited tofish models and creature models such as octopus models, jelly fishmodels, and the like can be used.

Industrial Applicability

By using a water tank for appreciation of the present invention, whenusing the water tank for appreciation of the present invention is usedas a pseudo aquarium, a display of fish models which are pseudo modelsof aquatic animals in a water tank swimming more naturally can beprovided without unnatural behavior such as imbalance due to adhesion ofair bubbles to fish models, sudden rising of fish models near the airbubble generating member, and lying near the water surface and the like,and further, display is also available regarding creatures and/orobjects represented by fish, submarines, spaceships, airships,butterflies, birds and the like which float space in pseudo space suchas underwater space or in the air.

1. A water tank for appreciation provided with a water storage, a waterpipe, an air bubble generating member, wherein (1) said water storage isprovided with a water inlet port and an opening portion, (2) saidopening portion is so provided that the convection is generated in saidwater tank for appreciation by liquid flow from a water tank throughsaid opening portion, (3) said water storage is provided upwardly of awater tank for appreciation, (4) one end of said water pipe is connectedto a water inlet port of a water storage and the other end is soinstalled that the other end is in liquid when filled with liquid in awater tank for appreciation, and (5) an air bubble generating member isso installed that can lead air bubble inside of said water pipe in theperiphery of said other end of said water pipe.
 2. A water tank forappreciation as set forth in claim 1 provided with at least 2 coilswound along the periphery of said water tank for appreciation.
 3. Awater tank for appreciation as set forth in claim 2, wherein coils woundalong the peripheral of said water tank for appreciation are so providedthat the distance between neighboring coils are set to be the length ofnot greater than 200% of a coil diameter in said water tank forappreciation.
 4. A water tank for appreciation as set forth in claim 2,wherein coils wound along the peripheral of said water tank forappreciation are so provided that the distance between neighboring coilsare set to be the length of from 80 to 120% of a coil diameter in saidwater tank for appreciation.
 5. A water tank for appreciation as setforth in claim 2, wherein the turn of coils wound along the periphery ofsaid water tank for appreciation is 20 to 200 turns.
 6. A water tank forappreciation as set forth in claim 2, wherein the turn of coils woundalong the periphery of said water tank for appreciation is 40 to 60turns.
 7. A display device for appreciation provided with models inliquid store in a water tank for appreciation, wherein said water tankfor appreciation is provided with a water storage, a water pipe, and anair bubble generating member, said water storage is provided with awater inlet port and an opening portion, said opening portion is soprovided that the convection is generated in said water tank forappreciation by liquid current from a water tank through said openingportion, said water storage is provided upwardly of a water tank forappreciation, one end of said water pipe is connected to a water inletport of a water storage and the other end is so installed that the otherend is in liquid when filled with liquid in a water tank forappreciation, and an air bubble generating member is so installed thatcan lead air bubble inside of said water pipe in the periphery of saidother end of said water pipe.
 8. A display device for appreciation asset forth in claim 7, wherein said models are creature models.
 9. Adisplay device for appreciation as set forth in claim 8, wherein saidcreature models use actuator elements in driving portions.
 10. A displaydevice for appreciation as set forth in claim 8, wherein said creaturemodels include at least one selected from the group of fish models,jelly fish models, octopus models, snake models, shell models, and seaweed models.
 11. A display device for appreciation as set forth in claim8, wherein said creature models are models of invertebrates and/orvertebrates.
 12. A display device for appreciation as set forth in claim9, wherein said actuator elements are polymeric actuator elements inwhich 2 metal layers are laminated through solid electrolytetherebetween.
 13. A display device for appreciation as set forth inclaim 9, wherein said creature models are provided with coils forgenerating power.
 14. A fish model wherein said fish model is providedwith said actuator elements between a body portion and a fin portionand/or a display device for appreciation as set forth in claim 10,wherein said actuator elements form a fin.
 15. A display device forappreciation as set forth in claim 7, wherein said models are providedwith light-emitting diode.
 16. A display device for appreciation as setforth in claim 15, wherein said creature models are provided with coilsfor generating power.
 17. A display device for appreciation as set forthin claim 7, wherein said water tank for appreciation is provided with atleast 2 coils wound along the periphery of said water tank forappreciation.
 18. A display device for appreciation as set forth inclaim 17, wherein coils wound along the peripheral of said water tankfor appreciation are so provided that the distance between neighboringcoils are set to be the length of not greater than 200% of a coildiameter in said water tank for appreciation.
 19. A display device forappreciation as set forth in claim 17, wherein coils wound along theperipheral of said water tank for appreciation are so provided that thedistance between neighboring coils are set to be the length of from 80to 120% of a coil diameter in said water tank for appreciation.
 20. Awater tank for appreciation as set forth in claim 17, wherein the turnof coils wound along the periphery of said water tank for appreciationis 20 to 200 turns.
 21. A water tank for appreciation as set forth inclaim 17, wherein the turn of coils wound along the periphery of saidwater tank for appreciation is 40 to 60 turns.